Nomenclature of the tourmaline-supergroup minerals

  title={Nomenclature of the tourmaline-supergroup minerals},
  author={Darrell J. Henry and Milan Nov{\'a}k and Frank Christopher Hawthorne and Andreas Ertl and Barbara L. Dutrow and Pavel Uher and Federico Pezzotta},
  journal={American Mineralogist},
  pages={895 - 913}
Abstract A nomenclature for tourmaline-supergroup minerals is based on chemical systematics using the generalized tourmaline structural formula: XY3Z6(T6O18)(BO3)3V3W, where the most common ions (or vacancy) at each site are X = Na1+, Ca2+, K1+, and vacancy; Y = Fe2+, Mg2+, Mn2+, Al3+, Li1+, Fe3+, and Cr3+; Z = Al3+, Fe3+, Mg2+, and Cr3+; T = Si4+, Al3+, and B3+; B = B3+; V = OH1- and O2-; and W = OH1-, F1-, and O2-. Most compositional variability occurs at the X, Y, Z, W, and V sites… 

The tetrahedrite group: Nomenclature and classification

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Bond-valence constraints around the O1 site of tourmaline

  • F. Bosi
  • Chemistry
    Mineralogical Magazine
  • 2013
Abstract The stabilities of possible Y(R3+ + R2+ + Li+) clusters around the W anion (O1 site) of the tourmaline structure were checked using the bond-valence approach. Arrangements involving R3+ =

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Abstract A gem-quality purplish-red tourmaline sample of alleged liddicoatitic composition from the Anjanabonoina pegmatite, Madagascar, has been fully characterised using a multi-analytical approach



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The results of chemical analyses of tourmaline are usually incomplete owing to difficulties in dealing with the light elements, valence states of transition metals, and problems with the